Andrew Dunstan <andrew(at)dunslane(dot)net> writes:
> ... It turns out (according to the analysis) that the
> only time we actually need to use NextChar is when we are matching an
> "_" in a like/ilike pattern.
I thought we'd determined that advancing bytewise for "%" was also risky,
in two cases:
1. Multibyte character set that is not UTF8 (more specifically, does not
have a guarantee that first bytes and not-first bytes are distinct)
2. "_" immediately follows the "%".
regards, tom lane